Table 6. Human fI: estimation of agreement statistics and twinning fractions.

The R ^obs _twin, R ^calc _twin, Britton α, H and ML α statistics were computed with phenix.xtriage using the same subset of data as in Table 5 ▶. R ^obs _twin and R ^calc _twin are the statistics introduced in Lebedev et al. (2006 ▶). The last two columns report the REFMAC5-estimated twin fractions when refining the final model against the 2.7 Å November 2009 data set and the 2.4 Å September 2009 data set, respectively.

P1 twin operator	Robstwin	Rcalctwin	Britton α	H α	ML α	REFMAC5 α (Nov. 2009)	REFMAC5 α (Sept. 2009)
h, k, l	—	—	—	—	—	0.33	0.28
−h, −k, l	0.169	0.436	0.331	0.337	0.249	0.21	0.22
h, −k, −l	0.172	0.438	0.316	0.326	0.276	0.10	0.22
−h, k, −l	0.086	0.336	0.420	0.419	0.370	0.36	0.28